- var_dump: documentation ( source)
- mb_strwidth: documentation ( source)
<?php
var_dump(mb_strwidth("@", "UTF-8"));
var_dump(mb_strwidth("※", "UTF-8"));
var_dump(mb_strwidth("*", "UTF-8"));
var_dump(mb_strwidth("+", "UTF-8"));
var_dump(mb_strwidth("①", "UTF-8"));